/**
 * 
 */
package t4j.concurrency;

import java.util.ArrayList;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;


class TaskWithResult implements Callable<String>{
	private int id;

	public TaskWithResult(int id) {
		this.id = id;
	}

	@Override
	public String call(){
		
		return "result of TaskWithResult " + id;
	}
	
}

public class CallableDemo {

	public static void main(String[] args) {
		ExecutorService exec = Executors.newCachedThreadPool();
		
		ArrayList<Future<String>> results = new ArrayList<Future<String>>();
		
		for(int i = 0 ; i < 10 ; i++)
			results.add(exec.submit(new TaskWithResult(i)));
		
		for(Future<String> fs : results){
			
			try {
				System.out.println(fs.get());
			} catch (InterruptedException e) {
				System.out.println(e);
				return;
			} catch (ExecutionException e) {
				System.out.println(e);
			}finally{
				exec.shutdown();
			}
			
		}
		
	}
}
